DETERMINATION OF PHASE EQUILIBRIA AND CRITICAL LOCUS OF CO_2-HCFC22 SYSTEM

1 INTRODUCTIONHydrochlorofluorocarbons(HCFCs)and hydrofluorocarbons(HFCs)are alternatives tochlorofluorocarbons(CFCs),such as CFC12(freon 12),which has been widely used asan aerosol agent and working fluid of domestic1:ICthdflC(CHCIFZ,HCFC22,R22)is one of the potential alternatives.It Is also one of the po-tentlal entralner for supercrltlcal fluid CO,extraction.